Non-slipping cover for pulleys.



T. J. CAHILL.

NON-SUPPING COVER FOR PULLEYS,

APPLICATION FILED MAR. 22, 1916. 1,217,270; Patented Feb. 27, 1917.

WITNESSES: I. INVENTOR M I]: JVwnzaarICahiZZ.

4 UNITED STATES PATENT OFFICE.

THOMAS J. CAHILL, OF SAN FRANCISCO, CALIFORNIA .IN'ON-SLIPPING COVER FOR PULLEYS.

specification of Letters Patent.

Patented Feb. 2'7, 1917.

Application filed March 22, 1916. Serial No. 85,866.

To all whom it may concern:

l 3e it known that I, THOMAS J. CAHILL, a cltizen of Australia, residing in the city and county of San Francisco and State of Cali:

fornia, have invented new and useful Imrovements in Non-Sli ping Covers for ulleys, of which the fol owing is a specification.

This invention is designed to. provide a V means by which the slipping of belts upon pulleys may be prevented. and the full force of the drivmg ower may be exerted without danger of disp acing the belt.

It consists of an endless rubber cover' which is sufliciently less in diameter than across therim.

In the running of machinery by the aid of belts and pulleys, it is difficult to retain the belt especially when it is slack, upon the pulley, and furtherwhen the latter is small or when it is wet. My invention is designed to overcome this difliculty.

As shown in the drawi g A represents an endless band, sufliciently smallerin diameter than the exterior diameter of the pulley 2, to'which it is to be applied, so that it will have to be stretched and extended a. little before it can belaced upon the pulley. This band is pre erably made of rubher or other adherent material. The inner surface may be smooth. to fit the surface of the pulley 2, to which it will adhere.

In some cases it will be found satisfactory to place such a band in the center of the.

pulley surface, and particularly if the pulley have a fiat face and .in order to provide a suflicient amount of curvature to enable a belt to keep its position in the center of the pulley, the thickest part ofthe applied band may be in the center and the thickness of the band may be fgradually diminished toward the edges 0 the pulley, so that the general convex surface will be formed over which the belt may travel.

The band, being of elastic material, will spread or .yield laterally over the pulley face when subjected to external pressure, as by a belt. Since the pulley face is wider than the band the. latter will not be cut by the edges of the pulley over which itwould spread were the band and pulley of the same width.

Having thus described my invention, what I claim and desire to secureby Letters Patcut is In combination with a pulley having a cylindrical periphery, an endless elastic band. stretched over the pulley periphery, said band being thickest in its center and gradually ta ering toward its side edges, and said p ey being wider than and extending beyondthe edges of the band whereby to afford a base over which said band" maylaterally yield when subjected to externalpressure. I

In testimony whereof I have hereunto set my hand in the presence of two subscribing witn. i

I THOMAS J. CAHILL. Witnesses:

Joim H. Hmmme, 

